In addition to pioneering a new fixed wireless access system for Internet access, Facebook also is working on a new spectrally-efficient air interface based on use of massive MIMO antenna arrays.

Terragraph is Facebook’s proposed new  60-GHz fixed wireless system focused on bringing high-speed internet connectivity to dense urban areas.

Project ARIES, presently in test mode, complements Terragraph by boosting spectrum efficiency. Project ARIES features a base station with 96 antennas, supporting 24 simultaneous streams. The first version of the prototype antenna array uses 96 transmit antennas, providing 10 times the spectral efficiency.

Facebook Project ARIES so far has achieved 71 bps/Hz, and Facebook engineers are aiming for supplying 100 bps/Hz eventually.

By way of comparison, that would surpass the efficiency of Long Term Evolution and vastly outperform most other interfaces ever commercially deployed.

In large part, that effort is based on use of massive MIMO.

Service Standard Max. net bitrateR

per carrier

per one spatial stream

(Mbit/s)

BandwidthB

per carrier

(MHz)

System spectral efficiency (R/B)/K

((bit/s)/Hz per site)

1G cellular NMT 450 modem 0.0012 0.025 0.064
1G cellular AMPS modem 0.0003[2] 0.030 0.0015
2G cellular GSM 0.013 × 8 timeslots = 0.104 0.2 0.17[4] (in 1999)
2G cellular D-AMPS 0.013 × 3 timeslots = 0.039 0.030 0.45[4] (in 1999)
2.75Gcellular CDMA2000 1× voice 0.0096 per phone call × 22 calls 1.2288 0.172 (fully loaded)
2.75Gcellular GSM + EDGE 0.384 (typ. 0.20) 0.2 0.33[4]
2.75Gcellular IS-136HS + EDGE 0.384 (typ. 0.27) 0.200 0.45[4]
3G cellular WCDMA FDD 0.384 5 0.51
3G cellular CDMA2000 1x PD 0.153 1.2288 0.1720 (fully loaded)
3G cellular CDMA2000 1×EV-DO Rev.A 3.072 1.2288 1.3
FixedWiMAX IEEE 802.16d 96 20 1.2
3.5G cellular HSDPA 21.1 5 4.22
4G MBWA iBurst HC-SDMA 3.9 0.625 7.23
4G cellular LTE 81.6 20 16.32
4G cellular LTE-Advanced 75 20 30
Wi-Fi IEEE 802.11a/g 54 20 0.900
Wi-Fi IEEE 802.11n 72.2 (short GI) 20 1.2
Wi-Fi IEEE 802.11ac 433.3 (short GI) 80
WiGig IEEE 802.11ad 6756 2160 1
TETRA ETSI 4 timeslots = 0.036 0.025
Digital radio DAB 0.576 to 1.152 1.712 0.08 to 0.17
Digital radio DAB with SFN 0.576 to 1.152 1.712 0.34 to 0.67
Digital TV DVB-T 31.67 (typ. 22.0) 8 0.55
Digital TV DVB-T with SFN 31.67 (typ. 22.0) 8 4.0 (typ. 2.8)
Digital TV DVB-H 5.5 to 11 8 0.14 to 0.28
Digital TV DVB-H with SFN 5.5 to 11 8 0.68 to 1.4
Digital cable TV DVB-C 256-QAMmode 38 6 N/A
Broadband modem ADSL2 downlink 12 0.962 N/A
Broadband modem ADSL2+ downlink 28 2.109 N/A
Telephone modem V.92 downlink 0.056 0.004 N/A

source: Wikipedia